diff --git a/cpukit/aclocal/rtems-ampolish.m4 b/cpukit/aclocal/rtems-ampolish.m4
index edb8fc4b51..9a7c0adf39 100644
--- a/cpukit/aclocal/rtems-ampolish.m4
+++ b/cpukit/aclocal/rtems-ampolish.m4
@@ -3,7 +3,7 @@
 AC_DEFUN([RTEMS_AMPOLISH3],
 [
 AC_PATH_PROG([PERL],[perl],[])
-AC_SUBST(AMPOLISH3,["\$(PERL) \$(top_srcdir)/${rtems_updir}ampolish3"])
+AC_SUBST(AMPOLISH3,["\$(PERL) ${ac_aux_dir}/ampolish3"])
 AM_CONDITIONAL([AMPOLISH3],
 [test x"$USE_MAINTAINER_MODE" = x"yes" \
   && test -n "${PERL}"])